Shears.



J. H. BOYE.

SHEARS.

APPLICATION FILED 1AN.23, 1915.

Patented May 2, 1916.

D STATES PATENT OFFCE.

JAMES H. BOYE, OF CI-IIOAGO, ILLINOIS, ASSIGNOR TO THE BOYE NEEDLECOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SHEARS.

Specfication of Letters Patent.

Patented May 2, 1916.

To all whom it may concern:

Beit known that I, JAMES H. BOYE, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Shears, of which the followingis a specification.

This invention pertains particularly to means for causing the cuttingedges of shears, or scissors, to contact closely at the cutting point asthe cutting point shifts in the cutting operation.

The primary Object is to provide simple and inexpensive means foreffectively accomplishing the purpose indicated.

The invention is illustrated, in its preferred embodiment, in theaccompanying drawing, in which- Figure 1 represents a plan view of apair of shears constructed in accordance with the invention; Fig. 2, abroken inner face view of one of the blades, showing it equipped with ayielding cam, the dotted lines indicating the companion-blade in opencondition; and Fig. 3, a broken sectional view taken as indicated atline 3 of Fig. 2.

Referring to Figs. 1 to 3, A and B represent the blades of a pair ofshears, connected by a pivot 1. The blade A, in the illustration given,is provided at its inner surface with a recess 2 which accommodates ayielding cam 3, preferably composed of a lea-fspring which conformsloosely to the socket or recess 2. By preference, the recess 2 iselongated in the direction of the length of the blade, and the pivot 1extends through the front portion of the spring. The spring isadditionally secured, by a rivet 4, which passes through the front endof the spring and through the blade.

The rear portion of the member .3, that is that portion which lies backof the blade B when said blade is disposed cross-wise of the blade A, asindicated by the dotted lines in Fig. 2, is bent or curved away from thesocket 2, thus affording a yielding cam over which the shank 5 of theblade B will ride in the closing operation.

comes of this patet may be obtained for The pivotal connection may besomewhat loose (generally being naturally thus), so that when the bladesare wide open they will move with perfect freedom. In the closingoperation, the back-edge 5 of the shank 5 of the blade B will firstencounter the raised portion of the spring, so that the yielding camwill both raise the rear edge of the blade and depress the cutting edgeand also tilt the blade on a transverse aXis. That is, the blade will betilted about the longitudinal axis a b as well as about the transverseaXis c d. Thus, the cutting edges 6 of the blades are. thrown into theclosest contact at the continuously-shifting cutting-point, in a mosteiiective manner, while the operation is free and easy. The result isthat even the most delicate and fiimsy materials may be sheared withabsolute "ease. Moreover, the tenclency is for the blades to continuallyresharpen themselves because of the manner in which they slide past eachother in the cutting operation, which affords no opportunity for thefabric to work between the blades. If desired, the point 3 of theyielding cam 3 may be 'the highestpoint of the cam, so that the tendencyto tilt the blade about its longitudinal aXis will continue during thecomplete operation of the closing of the blades. In the constructiondescribed, the blades may be bowed moderately lengthwise, as iscustomary.

What I regard as new and desire to secure by Letters Patent is Thecombination of a pair of pivotally connected Shear-blades, one of saidblades having a recess at its inner surface through which the pivoteXtends, a spring confined in said recess and through which the pivoteXtends, the rear end-portion of said spring being bent away from thesocket and having. a high point at one rear corner portion thereof, anda. rivet securing the front end of said spring in said recess.

v JAMES H. BOYE.

In presence of* A. C. FIsoHER, N. B. DEARBORN.

five cents each, by addressing the "commltioe' of Imaam Washington, D.c."

